When a hardware designer designs a PCB, he will consider the electrical signal and the layout of components on the circuit board and pay attention to the function of the product. PCB manufacturing and assembly are less considered. In order to make PCB production go smoothly, especially SMT assembly, special attention should be paid to PCB assembly design.
The PCB panel is a combination of multiple PCB unit boards with various possible connection modes, as shown in the figure below.
No matter what kind of PCB, a panel structure is usually required. However, there are many ways to design panels. It is sometimes difficult to determine which method and the number of panels to use.
PCB panels are usually made in a variety of ways, such as ABAB, ABCD or AAAA. It is difficult to generalize. Which type of panel is good needs to be determined by comprehensively considering the density and distribution of components on the board and the configuration of equipment. All these types of panels have their own advantages and disadvantages.
This type of panel has some advantages. First, it is applicable to the manufacturing mode with multiple PCB combinations in household appliances, toys and other products. Secondly, it is conducive to improve production efficiency, reduce costs, greatly reduce product turnover and semi-finished product inventory, and meet the needs of customers for rapid shipment.
However, this type of panel also has disadvantages. On the one hand, in the process of assembly line operation, product differentiation is difficult to manage, resulting in product confusion. On the other hand, when a board in the combination is of poor quality or even scrapped, the total number of panels will decrease, which is not conducive to manufacturing remedy.
As a common method, AAAA combined panel is the most widely used panel method. Many advantages contribute to its current leadership. First, this type of panel is suitable for all situations, regardless of the manufacturing conditions and product portfolio of SMT manufacturers. Secondly, the order panel is not affected by the manufacturing quantity, and the maximum number of panels can be effectively realized according to the maximum number of SMT equipment, so as to achieve the highest manufacturability in all panel combinations. Third, in the process of printing template design, the printing quality will not be reduced due to the influence of the pad direction of special components, and the operation will not be too difficult.
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SMT process: Printing--> inspection--> placement - >Inspection ->Welding -->Inspection --> Maintenance--> board splitting
Oct 19,2021 17:59